clearing things up, not sure if this is a cheat or not.
First of all, Emerald weapons weakness is NOT lighting, it is demi.
Secondly, to kill sephiroth you don't need any special materia like KOTR or quadra magic, just simply use healing spells and normal magic.
Thirdly, to get the key red xiii grandpa asks you to get just simply take the submarine and go underwater to one of the little islands and there should be like a cave follow it and there you go.
Lastly, you can get the quadra magic just with the highwind, fly to the crescent shaped island go right to the edge of the green (towards the direction of the cave) land, while you're going to land press the direction to where the cave is and you should just land on the lower floor (the dirty stuff).
I hope this was helpful to all of you ffvii fans,
sincerely yours truly
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